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[上接《宁夏医学杂志》1988;10(2):119] 5.Logistic 曲线的配合:这种曲线常用在研究生长和发育过程中的资料,在流行病学上不满一岁的婴儿各月龄麻疹发病率也符合这一曲线的规律。曲线形状略呈“S”形;曲线两端的上下各有一条渐近线;曲线中间有一转向点(沿曲线弧作切线穿过曲线的点)。 (1)方程式:y-=d、k/1+Ce~(rt)。此式又可演变为 k/y-d -1=Ce~(rt),两端各取自然对数值即为:log k-(y-d)/y-d=logeC+rt(式中e为自然对数底,k和d为曲线配合前尝试过程中取得的数值、C和r为
[上 接 “宁夏 医学 杂志” 1988; 10 (2): 119] 5. Logistic curve of the match: This curve is commonly used in the study of growth and development of the information in the epidemiology of infants under the age of one month The incidence of measles is also consistent with the law of this curve. The shape of the curve is slightly “S” shaped; there is an asymptote at each end of the curve; there is a turning point in the middle of the curve (the point where the curve is tangent to the curve). (1) Equation: y- = d, k / 1 + Ce ~ (rt). This formula can be further evolved as k / yd -1 = Ce ~ (rt), the natural logarithm of each end take the value is: log k- (yd) / yd = logeC + rt (where e is the natural logarithm, k and d for the curve before the attempt to obtain the value of the process, C and r is